Global Patent Index - EP 3235923 A1

EP 3235923 A1 2017-10-25 - HIGH-STRENGTH STEEL WITH YIELD STRENGTH OF 800 MPA AND PRODUCTION METHOD THEREFOR

Title (en)

HIGH-STRENGTH STEEL WITH YIELD STRENGTH OF 800 MPA AND PRODUCTION METHOD THEREFOR

Title (de)

HOCHFESTER STAHL MIT DEHNGRENZE VON 800 MPA UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

ACIER À HAUTE RÉSISTANCE, DONT LA LIMITE D'ÉLASTICITÉ EST DE 800 MPA ET SON PROCÉDÉ DE PRODUCTION

Publication

EP 3235923 A1 (EN)

Application

EP 15869228 A

Priority

  • CN 201410810303 A
  • CN 2015096638 W

Abstract (en)

A high-strength steel having a yield strength at a level of 800MPa and a method of manufacturing the same, with the components and amounts thereof by weight percentage being: C:0.06-0.14%, Si: 0.1-0.30%, Mn: 0.8-1.60%, Cr: 0.2-0.70%, Mo: 0.1-0.40%, Ni: 0-0.30%, Nb: 0.01-0.030%, Ti: 0.01-0.030%, V: 0.01-0.05%, B: 0.0005-0.0030%, Al: 0.02-0.06%, Ca: 0.001-0.004%, N: 0.002-0.005%, P‰¤0.02%, S‰¤0.01%, O‰¤0.008%, the balance of Fe and unavoidable impurities; wherein the above elements meet the following relationships: 0.40%<Ceq<0.50%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; 0.7%‰¤Mo+0.8Ni+0.4Cr+6V‰¤1.1%; 3.7‰¤Ti/N‰¤7.0; 1.0‰¤Ca/S‰¤3.0.

IPC 8 full level (invention and additional information)

C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/54 (2006.01)

CPC (invention and additional information)

C22C 38/54 (2013.01); C21D 1/22 (2013.01); C21D 8/0226 (2013.01); C21D 8/0263 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); C21D 9/46 (2013.01); C21D 2211/008 (2013.01)

Citation (search report)

See references of WO 2016095720A1

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

EPO simple patent family

EP 3235923 A1 20171025; EP 3235923 A4 20180627; CN 104513937 A 20150415; JP 2018505305 A 20180222; US 2017349987 A1 20171207; WO 2016095720 A1 20160623

INPADOC legal status


2018-06-27 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20180528

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/58 20060101AFI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/48 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C21D 8/02 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/54 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/44 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/50 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/06 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/46 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/04 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C21D 9/46 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/00 20060101ALI20180517BHEP

2018-06-20 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: C22C 38/02 20060101ALI20180517BHEP

2018-03-28 [DAV] REQUEST FOR VALIDATION OF THE EUROPEAN PATENT (IN ANY COUNTRY) (DELETED)

2018-03-28 [DAX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT (TO ANY COUNTRY) (DELETED)

2017-10-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20170629

2017-10-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

2017-10-25 [AV] REQUEST FOR VALIDATION OF THE EUROPEAN PATENT IN:

- Countries: MA MD

2017-10-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: BA ME